Once the books are MOBI or PDF, we can easily transfer them from PC (or Mac) to Kindle, Paperwhite, Kindle Fire (HD), Kindle for Android / iPad app with USB or wirelessly.

For each case below, I mainly explain how to transfer MOBI eBooks to Kindle with USB, which also works on PDF docs. To transfer books to Kindle without a USB cable, you should first find out the device email address (mentioned in each case), then send your books to the given device/app address.

#3 Check the transferred books by tapping “Books” (on the top menu bar) then “Device”.

Send-to-Kindle E-mail Address of Kindle Fire:

Tap the top right corner, select “More…” -> “My Account” to get the device email address.

Transfer books to Kindle Fire (HD) wirelessly

3. Transfer MOBI/PDF books to Kindle for Android app

Here I take the Nexus 7 for example.

#1 Connect your Android tablet or smart phone to PC.

#2 Go to the “Kindle” folder of your Android device storage. Copy and paste the MOBI books to that folder.

#3 Tap the menu icon in the top right corner of Kindle app, then select “On Device” to check the transferred books.

Send-to-Kindle E-mail Address of Kindle for Android app:

Tap the menu icon (top left corner), then “Setting” to get the “Send-to-Kindle E-mail Address”.

Transfer books to Kindle for Android app wirelessly

4. Transfer MOBI/PDF books to iPad / iPod / iPhone Kindle app

There is no way to directly transfer MOBI books to Kindle iPad / iPod / iPhone app with iTunes. In this case, we can use Kindle email system to send personal MOBI books to the email address of Kindle for iPad app. PDF files can be transferred to iPad with iTunes (opened with iBooks by default) or with Kindle for iPad email address (opened with Kindle for iPad app by default).

We can also download the ebooks by the download link and select Kindle app to open it.

Send-to-Kindle E-mail Address of Kindle for iPad app:

Tap the gear icon in the bottom right corner and select “Send-to-Kindle Email Address”.

Transfer books to Kindle for iPad/iPod/iPhone wirelessly

5. Transfer MOBI/PDF books to Kindle wirelessly (without a USB cable)

As long as we know the email addresses of the Kindle devices or apps, we will be able to send DRM-free MOBI and PDF books to Kindle, Kindle Paperwhite, Kindle Fire (HD), Kindle for Android / iPad app wirelessly.

Tap sync icon on the Kindle device or Kindle app. In minutes, you will find the sent MOBI and PDF docs under “All Items” and “Docs” category (Cloud).

(This screenshot was taken on Nexus 7. )

Note:

When you transfer PDF books to Kindle from computer, you will find the books not shown under “Books” (on device) shelf or category. That’s right. PDF books typically display under “Docs” (on device) shelf.

If your purchased Kindle books are not auto synced due to an Internet issue, you can download the books to your computer (Amazon site -> “Manage Your Kindle” under “Your Account” -> “Actions…” -> “Deliver to my…” -> “Download and transfer via USB”) to download the books to your computer. The downloaded books are typically AZW3. Transfer them to your Kindle device or app according to steps above.

The bottom line

This guide is based on Windows OS, but it also works if you want to transfer books to Kindle from Mac. As long as the books are not protected and converted to Kindle supported formats (MOBI or PDF), we will be able to read eBooks from other sources without confining to Amazon.